Steve,
I would not recommend using AutoDeploy if you only have this two-host-cluster and no more ESXi hosts.
AutoDeploy is meant to ease the deployment and patch management of large scale environments.
In such environments it is good practice to have a separate cluster dedicated to running critical infrastructure machines (like vCenter), and the hosts in this "management cluster" should not use AutoDeploy but should be installed the traditional way.
- Andreas